condition mean min max ZT0-3 391.29999999999995 391.29999999999995 391.29999999999995 ZT4-7 361.5 361.5 361.5 ZT8-11 362.7 362.7 362.7 ZT12-15 369.95 369.95 369.95 ZT16-19 448.45000000000005 448.45000000000005 448.45000000000005 ZT20-23 487.7 487.7 487.7